I have never seen any lead-fouling in any .22 Rim Fire I have ever owned. The only fouling I have seen, even from extensive shooting, is from the burned powder/primer. If you are using copper-plated ammo in a .22 Rim Fire to escape "fouling", I think you are wasting your time. If your gun actually "leads", you likely have a rough bore.
My Ruger SR-22 fouls badly without FMJ it's had several thousand rounds through it and the barrel seems fine to me.
About splatter, it's not much of an issue really I mount mine like this;
You can adjust the angle by adjusting the backing nut. It works very well and the target is free to move and ring.